Name:
ASTM D2598-12 PDF
Published Date:
11/01/2012
Status:
Active
Publisher:
ASTM International
1.1 This practice covers, by compositional analysis, the approximate determination of the following physical characteristics of commercial propane, special-duty propane, commercial propane/butane mixtures, and commercial butane (covered by Specification D1835): vapor pressure, relative density, and motor octane number (MON).
1.1.1 This practice is not applicable to any product exceeding specifications for nonvolatile residues. (See Test Method D2158.)
1.1.2 For calculating motor octane number, this practice is applicable only to mixtures containing 20 % or less of propene.
1.1.3 For calculated motor octane number, this practice is based on mixtures containing only components shown in Table 1.
TABLE 1 Factors for Determining the Physical Characteristics of LP-GasesAComponent
Vapor Pressure Blend Factor, kPa-gage
(PSIG) at 37.8°C (100°F)
Relative Density at 15.6°C (60°F)
MON Blend Value
Methane
17547 (2545)
0.3
. . .
Ethane
4213 (611)
0.3563
100.7
Ethene (Ethylene)
8720 (1265)
0.37
75.6
Propane
1200 (174)
0.5072
97.1
Propene (Propylene)
1466 (213)
0.5226
84.9
Methylpropane (Isobutane)
400 (58)
0.5629
97.6
n-Butane
255 (37)
0.5842
89.6
t-2-Butene
242 (35)
0.6099
…
1-Butene
328 (48)
0.6004
80.8
2-Methylpropene (Isobutylene)
340 (49)
0.6004
…
c-2-Butene
216 (31)
0.6275
83.5
2,2-Dimethylpropane (Neopentane)
152 (22)
0.5961
80.2
Cyclopentane
-33 (-4.7)
0.7503
84.9
2-Methylbutane (Isopentane)
40 (5.8)
0.6251
90.3
n-Pentane
6.4 (0.9)
0.6307
62.6
n-Hexane
-67 (-9.7)
0.6641
26.0
A Some constants for vapor pressure and motor octanes are empirical values to be used only in the calculation procedures described in this practice. References are located in Appendix X1.1.2 The values stated in SI units are to be regarded as standard. The values given in parentheses are for information only.
1.2.1 Exception-Motor octane number and relative density are given in MON numbers and dimensionless units, respectively.
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| Published : | 11/01/2012 |
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